Joggling tool

ABSTRACT

A joggling tool explosively actuated to release energy at a high rate to a punch member which physically imparts a force to a workpiece held in a forming die member to accomplish a joggle or indentation therein. A cartridge mounted upon an inner barrel member is fired to develop explosive gas in its bore chamber to drive the punch member. An outer barrel member is mounted about the inner barrel member to guide the movement of the punch member. A breech housing circumscribes both barrel members and has mounted thereon a firing device for the cartridge. The outer barrel member is supported by a frame member or yoke which is securely mounted, such as by locating pins, to the forming die member.

Mershon et a1.

3,827,278 Aug. 6, 1974 JOGGLIING TOOL Inventors: Butler A. Mershon; Keith A.

Wilhelm, both of Burbank, Calif.

Assignee: Lockheed Aircraft Corporation,

Burbank, Calif.

Filed: June 4, 1973 Appl. No.: 366,713

US. Cl. 72/430, 29/421 E lint. Cl B2lj 7/24 Field of Search 72/430; 29/421 E, 200 E;

References Cited UNITED STATES PATENTS Primary Examiner-Charles W. Lanham Assistant Examiner-Gene P. Crosby Attorney, Agent, or Firm--Bil1y G. Corber; Frank L. Zugelter 5 7] ABSTRACT A joggling tool explosively actuated to release energy at a high rate to a punch member which physically imparts a force to a workpiece held in a forming die member to accomplish a joggle or indentation therein. A cartridge mounted upon an inner barrel member is fired to develop explosive gas in its bore chamber to drive the punch member. An outer barrel member is mounted about the inner barrel member to guide the movement of the punch member. A breech housing circumscribes both barrel members and has mounted thereon a firing device for the cartridge. The outer barrel member is supported by a frame member or yoke which is securely mounted, such as by locating pins, to the forming die member.

15 Claims, 4 Drawing Figures PATENTED 51974 w A? v- "p W55; so Q FIG.. 4

BACKGROUND OF THE INVENTION 1. Field of the Invention The field of art to which the invention is most likely to pertain is located in a class of devices generally relating to metal deforming. Classes 72, Metal Deforming; 29, Metal Working; and 173, Tool Driving and Impacting, U.S. Patent Office Classifications, may be the applicable general areas of art in which the claimed subject matter of the type involved here may be classified.

SUMMARY OF THE INVENTION This invention relates to mechanical metal forming and is particularly related to a tool explosively actuated to drive a punch member upon a metal workpiece supported in a die forming member, to form a nondistorted indentation.

An object of this invention is to improve joggle definition in a workpiece.

Another object of this invention is to reduce, minimize or eliminate axial or other distortion which heretofore occurred in mechanically deformed metal workpieces with conventional devices and methods.

Another object of this invention is to reduce or eliminate workpiece springback after the joggling operation.

Another object of this invention is to reduce joggling operation time.

A further object of this invention is to improve or increase the structural integrity of the workpiece after the joggling operation thereon, and which is due to improved forming and the holding of close tolerances of the joggle configuration.

Yet another object of this invention is to eliminate the necessity for heavy and costly equipment, such as hydraulic stretch presses with bulldozing attachments.

Other objects of this invention is to provide lost cost tools'and equipment therefor, a high speed operation, elimination of hand operations, adaptability to all sizes and configurations of joggles, and minimization of setup and tool change time.

These and other objects and advantages will become fully apparent upon a complete reading of the following description, appended claims thereto, and the accompanying drawing comprising two sheets.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a sectional view of a joggling tool embodying the invention.

FIG. 2 is a plan view of an extractor mechanism utilized in the joggling tool.

FIG. 3 is an enlarged sectional framentary view of FIG. 1.

FIG. 4 is an end view of the joggling tool mounted on a forming die.

DESCRIPTION OF THE PREFERRED EMBODIMENT Referring now to the drawing in which reference characters correspond to like numerals hereinafter, reference character characterizes the joggling tool which embodies our invention. The preferred embodi ment of the joggling tool 10 comprises a frame member or yoke 12, an outer barrel member 14 mounted to and supported by the yoke 12, a breech closure member or housing 16 fastened or secured to the outer barrel member 14, a means 18, such as a solenoid, for actuating a firing means 20 adapted to strike a cartridge 22 (FIG. 3) seated in a chamber 24 of an inner barrel member 26 mounted within the outer barrel member 14, and a punch member 28 fitted to the lower end 30 of the inner barrel member 26 and being disposed within an annular relief 32 provided in the interior wall of a bore 34 formed in the outer barrel member 14 for guiding the stroke of the punch member 28. An extractor mechanism 36 (FIGS. 2, 3) is provided for removing the cartridge 22 from the chamber 24 after firing of the joggling tool 10.

The outer barrel member 14 is secured to the yoke 12, preferably by means of being threaded to a bushing 38 press fit to a suitable aperture in the yoke 12. The muzzle or lower end of the outer barrel member 14 is provided with a radiused surface 40 which matches or mates to a corresponding annular radial flange or face 42 provided on the punch member 28. The diameter and thickness of the radial flange 42 is so designed as to engage the surface 40 to effect a seal and a stop. The punch member 28 constitutes a forming mandrel and comprises a joggle or indentation forming head 44 integrally formed upon the radial flange 42 and a hollow stem 46 formed upon the radial flange 42. The stem 46 includes a cavity 48 into which the inner barrel member 26 is introduced upon the tool s assembly. Preferably, the lower portion of the inner barrel member 26 is tapered, while the hollow stem 46 is cylindrical. Also, a clearance (FIG. 3), say 0.003 inch, between the stem 46 and the upper portion (maximum diameter) of the inner barrel member 26 has been found to provide exceptional efficiency in the tools operation as it is fired.

The breech housing 16 and the outer barrel member 14 are provided with intermittently spaced mating sets of lugs or interrupted corresponding threads 50, 52, respectively, for interlocking these members together (i.e., by a quarter turn one to the other, the members l6, 14 are secured to each other). A recess 54 is provided in the upper end of the outer barrel member 14 for seated disposition of the extractor mechanism 36 about the upper end of the inner barrel member 26. The extractor mechanism 36 (FIGS. 2, 3) comprises a collar 56 securely mounted (threaded) to the inner barrel member 26 and adapted to seat in the recess 54, an annular flange 58 mounted atop the collar 56, and a pair of opposing ejecting fingers 60 each pivotally mounted in the flange 58 by means of a pin 62. Each ejecting finger 60 is spring loaded upwardly, as at 64,

and includes a lip 66 adapted to engage under the rim of the cartridge 22 inserted in the chamber 24. Upon the removal of the breech housing 16 after firing of the joggling tool 10, the spring loaded ejecting fingers 60 pivot upwardly. As they do, their lips 66 forcefully remove the cartridge 22 sufficiently from its seat at the end of the chamber 24 to facilitate hand removal of the fired cartridge shell. A cover plate 68 for the mechanism 36 is secured, as by screws 70, to the top of the flanged element 58 and includes a suitable aperture for the fingers 60.

The firing means 20 is mounted in a suitable hole provided atop the breech housing 16, and comprises a spring-biased firing pin 72 which is adapted to extend into the open interior of the housing 16. Thus, in assembly and operation of the tool 10, the firing pin 72 strikes the cartridge 22 for detonating same. The solenoid 18 is of a conventional nature, and upon energization thereof, its shaft 74 translates to push the pin 72 of the firing means 20 into the cartridge 22.

In operation of the joggling tool 10, it is preferable that it be disposed in such a horizontal position so as to cause the punch member 28 to translate in a horizontal direction. A metal piece-to-be-worked 76 is first introduced into a forming die member or block 78 having formed therein a desired configured die surface 80 towards which the head 44 of the punch member 28 is directed. The joggling device is then mounted upon the forming die member 78 and held securely thereon by means of a plurality of locating pins 82 extending through the yoke 12, which is bifurcated in this embodiment, and the forming die member 78. The locating pins 82 provide a positive positioning and coupling of the bifurcated member. A cartridge 22, such as a .357 Magnum, is inserted into the upper end of the chamber 24 after the ejecting mechanism 36 has been securely mounted to the inner barrel member 26 and the member 26 slip-fitted to the bore 34 of the outer barrel member 14. Thereafter, the breech housing 16 is mounted on and quarter-turned into threaded securement with the outer barrel member 14, thereby aligning the firing means with the cartridge 22. The energization of the solenoid l8 actuates such firing head and may be accomplished by any suitable means. Such actuation causes the firing pin 72 to strike the cartridge 22, thereby detonating same. The force of the expanding gases in the chamber 24 causes the punch member 28 to shoot forward, its head 44 striking against the workpiece 76 and joggling a desired portion thereof into the configured indentation or the like formed by the die surface 80.

The assembly of the joggling tool 10 occurs when a joggling action is desired to be performed upon the workpiece 76. The outer barrel member 14 is threaded to the press fit bushing 38 already secured to its frame member 12, before or after the locating pins 82 have positioned the member 12 on the workpiece. The punch member 28 must, of course, be introduced into the annular relief 32 prior to mounting the yoke 12 onto the workpiece 76, and may be so introduced before or after the inner barrel member 26 is mounted in the bore 34 of the outer barrel 14. After the extractor mechanism 36 has been threaded to the inner barrel member 26, both are inserted into the recess 54 and bore 34 of the outer barrel member 14. A cartridge 22 is then inserted into the chamber 24. The breech housing 16 is introduced to the outer barrel member 14 and fastened thereto. The fastening of the breech housing 16 to the outer barrel housing 14 is such as to effect a seal between the base of the collar 56 and the bottom of the recess 54. The breech housing 16 and the solenoid 18 are preferably fashioned into a single unit for concurrent mounting to the outer barrel member 14. Although not shown, it should be understood that suitable electrical wiring is provided for the solenoid 18 and which is connected to, say, a 1 10 volt AC source.

Before the cartridge 22 is fired, the punch member 28 is positioned (manually) whereby its mating surface 42 engages its corresponding surface 40 on the outer barrel member 14 so as to provide a seal which effects an efficient punching action for the punch head 44 and which also functions as a stop for the punch 28 in its retracted position in the annular relief 32.

For actual operation of the tool 10, various advantageous expedients may be adapted thereto. For example, guide members may be secured to the inside walls of the legs or depending members forming the bifurcated frame member 12 for the purpose of additionally guiding and aligning the direction of the motion of the punch member 28. The punch member 28 is generally rectangularly fashioned for this purpose. The punch member 28 itself, of course, includes a molding surface or face which complements the indentation in the forming die 78. Also, the position of the outer barrel member 14 relative to the workpiece 76 may be made adjustable by means of a set screw (not shown) tightening it to the yoke 12. Further, clamps in the form of blocks may be screw fastened to the top portion of the yoke 12 to hold or clamp the workpiece in place and to prevent the effect of the joggle from travelling outside the immediate punching area. In this case, any hand operations are reduced to those necessary for contour deviation only.

The results of and advantages in the use of the tool 10 have been excellent. The configuration of joggles formed is accurate, sharply defined and free of web distortion. The portability of the tool and its attendant accessories provides increased latitude as to where forming may be done, in press or at a work station out of press. The tooling costs of present joggle die blocks, guides, pins, yokes and shop aid items to perform hydraulic joggling are eliminated by use of the tool 10.

Pursuant to the requirements of the patent statutes, the principle of this invention has been explained and exemplified in a manner so that it can be readily practiced by those skilled in the art to which it pertains, or with which it is most nearly connected, such exemplification including what is presently considered to represent the best embodiment of the invention. However, it should be clearly understood that the above description and illustrations are not intended to unduly limit the scope of the appended claims, but that therefrom the invention may be practiced otherwise than as specifically described and exemplified herein, by those skilled in the art, and having the benefit of this disclosure.

Therefore, what we claim as patentably novel is:

l. A joggling tool comprising in combination,

a frame member,

an outer barrel member securely mounted on said frame member and having a bore ending in a muzzle,

an inner barrel member seated in said bore and having a chamber coextensive with its length for fitting an explosive charge means thereto,

an annular relief provided in the muzzle of said outer barrel member,

a punch member including a cavitous stem fitted to said annular relief and about said inner barrel member, the chamber communicating with the cavity of said stem,

a breech housing secured to said outer barrel member end,

a firing means mounted in said breech housing and in alignment with said chamber, and

means for actuating said firing means mounted on said housing.

2. The tool of claim 1 wherein said actuating means comprises a solenoid having a shaft operatively connected to said firing means.

3. The tool of claim 2 wherein said firing means comprises a spring-loaded firing pin.

4. The tool of claim 1 wherein the cavity in said cavitous stem forms a right cylinder and said inner barrel member includes a tapered portion disposed in the cavity.

5; The tool'of claim 1 wherein said punch member mates with said muzzle in its retracted position to effect a stop and seal.

6. The tool of claim 5 wherein the cavity in said cavitous stem forms a right cylinder and said inner barrel member includes a tapered portion disposed in the cav- 6 ity.

7. The tool of claim 6 wherein said firing means comprises a spring-loaded firing pin.

8. The tool of claim 7 wherein said actuating means comprises a solenoid having a shaft operatively connected to said firing means.

9. The tool of claim 1 in combination with means for positioning it on a die forming member supporting a workpiece to be joggled.

10. The tool of claim 9 wherein said positioning means comprises at least one locating pin connecting said frame member to the die forming member.

11. The tool of claim 9 wherein said actuating means comprises a solenoid having a shaft operatively connected to said firing means.

12. The tool of claim 11 wherein said firing means comprises a spring-loaded firing pin.

13. The tool of claim 9 wherein the cavity in said cavitous stem forms a right cylinder and said inner barrel member includes a tapered portion disposed in the cavity.

14. The tool of claim 9 wherein said punch member mates with said muzzle in its restricted position to effect a stop and seal.

15. The tool of claim 14 wherein the cavity in said cavitous stem forms a right cylinder and said inner barrel member includes a tapered portion disposed in the cavity. 

1. A joggling tool comprising in combination, a frame member, an outer barrel member securely mounted on said frame member and having a bore ending in a muzzle, an inner barrel member seated in said bore and having a chamber coextensive with its length for fitting an explosive charge means thereto, an annular relief provided in the muzzle of said outer barrel member, a punch member including a cavitous stem fitted to said annular relief and about said inner barrel member, the chamber communicating with the cavity of said stem, a breech housing secured to said outer barrel member end, a firing means mounted in said breech housing and in alignment with said chamber, and means for actuating said firing means mounted on said housing.
 2. The tool of claim 1 wherein said actuating means comprises a solenoid having a shaft operatively connected to said firing means.
 3. The tool of claim 2 wherein said firing means comprises a spring-loaded firing pin.
 4. The tool of claim 1 wherein the cavity in said cavitous stem forms a right cylinder and said inner barrel member includes a tapered portion disposed in the cavity.
 5. The tool of claim 1 wherein said punch member mates with said muzzle in its retracted position to effect a stop and seal.
 6. The tool of claim 5 wherein the cavity in said cavitous stem forms a right cylinder and said inner barrel member includes a tapered portion disposed in the cavity.
 7. The tool of claim 6 wherein said firing means comprises a spring-loaded firing pin.
 8. The tool of claim 7 wherein said actuating means comprises a solenoid having a shaft operatively connected to said firing means.
 9. The tool of claim 1 in combination with means for positioning it on a die forming member supporting a workpiece to be joggled.
 10. THe tool of claim 9 wherein said positioning means comprises at least one locating pin connecting said frame member to the die forming member.
 11. The tool of claim 9 wherein said actuating means comprises a solenoid having a shaft operatively connected to said firing means.
 12. The tool of claim 11 wherein said firing means comprises a spring-loaded firing pin.
 13. The tool of claim 9 wherein the cavity in said cavitous stem forms a right cylinder and said inner barrel member includes a tapered portion disposed in the cavity.
 14. The tool of claim 9 wherein said punch member mates with said muzzle in its restricted position to effect a stop and seal.
 15. The tool of claim 14 wherein the cavity in said cavitous stem forms a right cylinder and said inner barrel member includes a tapered portion disposed in the cavity. 